The descent was made in a Nomad 8.5 with a custom-engineered implosion prevention device.
Niagra is certainly in the same height range as Palouse, and it has been run (unsuccessfully/fatally) before. However, it's a wide ledge instead of a spout-type falls, which may complicate the line. Tyler said "once was enough" and there are some serious legal issues surrounding a descent of Niagra. I would guess that anyone who is seriously considering a descent down a 180 ft. falls would pick a spot where the powers that be can't turn the water flow down as you paddle toward the lip. Just because these guys are ballsy doesn't mean they huck every big waterfall that they can find. Some drops are more suitable than others- lines, logistics, and legality.
"A river is more than an amenity, it is a treasure."
-Oliver Wendell Holmes writing for the majority in New Jersey v. New York